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811A Tubes - Tubes - Transmitting, Audio, Misc.
https://www.rfparts.com/tubes/tubes-811a.html
The RF Parts Company Tubes (SELECT) 811A is the best quality 811A tube in current production. Usage tests show it to be equal to the much-respected RCA, 811A and Svetlana, 811A. Base indexed and internal structure aligned and supported for both horizontal and vertical operation. Ideal for the Collins 30L1 and similar equipment where tubes mount ...
Rca JAN-811A Amplifier Audio Tubes - Tubesocketvintagego
https://tubesocketvintagego.com/jan-811a
Review (mpn: JAN-811A for sale) JAN-811A Pair Jan RCA 811A Amplifier Audio Tubes They both tested exactly 50 where 36 is minimum. Both have clear glass, no signs of heat, and loose parts or elements.
811 811A Amplifier | diyAudio
https://www.diyaudio.com/community/threads/811-811a-amplifier.354865/
The 811 is a pretty looking tube. But you are not going to be able to use RC coupling. Either DC coupled to the 811, or use an interstage. 811 Mu is extremely high, but the plate resistance is extremely high too. 811 is suited for Class C RF amplifiers. 811 is suited for audio class B amplifiers with negative feedback.
Vacuum Tube - 811A, Triode, Power Amplifier, China ...
https://www.tubesandmore.com/products/vacuum-tube-811a-triode-power-amplifier-china
Vacuum Tube - 6550, JJ Electronics. The JJ Electronic 6550 is a robust tube built in the rugged fashion that JJ is famous for. At 35 Watts, these tubes have a warm round tone with a thick and defined low end. The JJ 6550 is an excellent choice for bass heads, tube organs, and Hi-Fi amplifiers. Starting at $42.95.
Tube 811a : Welcome to Hifi-Amplifiers.com!
https://www.hifi-amplifiers.com/en/t/tube-811a-k-481.html
Tube 811a : Welcome to Hifi-Amplifiers.com! - Preamp,amp,tubes,Hifi Cable,CD player
homebrew 811A amplifier project | WorldwideDX Radio …
https://www.worldwidedx.com/threads/homebrew-811a-amplifier-project.34449/
The 811a tube was originally designed for audio use and it really wasn't for use at RF frequencies but, what do I know, the manufacturers use them all the time (but you don't see them operating above 30 MHz). The 572b tube is the beefed-up RF version of the 811a and, it fits in the same tube socket and has the same voltage and current requirements.
How To Build The DX-811A All-Band Linear Amplifier CQ ...
http://www.813am.qsl.br/artigos/linear/DX-811A_GG_Linear_Amplifier.pdf
used on many 811A amplifiers. Caution: If no bias is used, the resting plate current will be 150 mA for the four tubes. When the amplifier is keyed up and tuned for full power, the tubes will reach full plate dissipation capability very rapidly, as evidenced by glowing red …
An 811-A 200 Watt Grounded Grid Linear Amplifier
http://www.qro.it/amp/schemi/pdf/68hb187.pdf
AN 811-A 200-WATT GROUNDED-GRID LINEAR AMPLIFIER The amplifier shown in Figs. 6-56, 6-58 and 6-59 requires about 15 watts of excitation power to drive it to full peak input (200 watts) on 3.5 through 30 MC. For convenience and compact- ness, the amplifier is completely self-contained ; silicon-diode rectifiers in the plate and bias sup-
SE 811 amp schematic... | diyAudio
https://www.diyaudio.com/community/threads/se-811-amp-schematic.262767/
In simple terms, it is the ratio of output impedance to (rated) load impedance. The venerable Dyna ST-70's DF was listed as 15, or ~1.07 ohms output impedance (assumimg 16 ohm tap as that's where the feedback loop is taken). Artosalo's 811A amplifier would calculate to a …
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